October 20, 2012 Subject:
This is not the final Richard Hannay novel as the title would lead you to believe; in fact it's a completely unrelated book with two pseudonymous authors.
User "willhansen" is mistaken about "Susan Tweedsmuir (later Buchan)"; she was Susan Grosvenor by birth, Susan Buchan by marriage, and Susan, Baroness Tweedsmuir when her husband was elevated to the peerage on his appointment as Governor-General of Canada.
May 10, 2012 Subject:
User "sorbonnetoga" is correct that this is not the work by John Buchan in the series featuring his character Richard Hannay. However, the attribution to Buchan and Susan Tweedsmuir (later Buchan) is correct; it is a completely different work, published early in Buchan's career.